If I am going to use an Azure use assigned app to authenticate the Azure sql database , and the secret of the App is put in keyvault. the library in the following
public SecretClient (Uri vaultUri, Azure.Core.TokenCredential credential);
build a connection to keyvault, before it can retrieve the secret from the keyvault.
what actually need to input to the above 'TokenCredential'???
so I will need another Azure user assigned app to access to the keyvault?